Method and means for identifying conductor pairs



y 1957 H. c. J. LOWMAN ET AL 2,799,739

' METHOD AND MEANS FOR IDENTIFYING CQNDUCTOR PAIRS Fild April 17, 1956 5 Sheets-Sheet 1 F/Cf J y 1957 H. c. J. LOWMAN ET AL 2,799,739

METHOD AND MEANS FOR IDENTIFYING CONDUCTOR PAIRS Filed April 17, 1956 5 Sheets-Sheet 2 DISTRIBUTING FRAME MAIN wcounva CABLE E wm .NM/A w G VON CONTROL RON,

OPERATING STAN H. C. J. LOWMAN M. MURPH V E, WVENTORS J. c. MUSGRAVE JR.

MLSOMERS July 16, 1957 H. c. J. LOWMAN ET AL METHOD AND MEANS FOR IDENTIFYING CONDUCTOR PAIRS Filed April 17, 1956 5 Sheets-Sheet s z awe/em" -/NVENT0P$ J c MUSGRAVE,JR

- MLSOMERS By (2 z go/way y 5 Y H. c. J. LOWMAN ET AL 2,799,739

METHOD AND MEANS FOR IDENTIFYING CONDUCTOR PAIRS Filed April 17, 1956 5 Sheets-Sheet 4 c. J. LOWMAIV 1g. MURPHY 1..

nvvs/vro/es use/M VE,JR.

M. sous/e AT TORNEV y B, 1957 He. J. LOWMAN ET AL 2,799,739

METHOD AND MEANS FOR IIDEIJTIFYING CONDUCTOR PAIRS Filed April 17, 1956 5 Sheets-Sheet 5 WW .11 cjm aA vs, JR.

By .L.$0

ATTORA/FV United States Pate-m g e METHOD MEANSFOR' IDENTIFYING (IONDUCTGR PAIRS Henry-CaLovgman, EdwarmMaMurphy, John (3-. Minsgrave', and Melvin. L. .somers -Boise Idaho, assignors; to. Americanflfelephone andI-elegraph .Gompany, a con- Applinatibn-Apriltsl'l,1956; Senial No. 578,74Tf

I Cfaimsa (Cl..1.7.9,-.-1.'75 .25)

'This invention relates 'to' a method and means for identifying-and" selecting" conductor pairs in, a' mul'ti condhctor-cable; -theends of which terminate at loca.. tions-remote-fromeach otheryand more particularly to automatic means operable by a single person which" selects and applies tone to a conductor-pairinzthe-cable whereby the conductor'pair may be readily-identified and" connected to its respective terminal or to a: corresponding conductor pair in another cable. j

The installationand-connection of multi-conductor cable; and in particular telephone cable, usually involves the useof. a cable having a relatively" small number of conductor-pairs i'n-a single group-or bundle or a large number of pairs-divided into several groups or bundles. Thesecondunctorpairs, either in groups or in bundles, are usually confined in a: common sheath or covering which may be ofIe'ad' or some other suitable sheathing-mate rialileis-essential that the conductor pairs, in these" groupswhich make up the cable, be connected to theirproper terminals at each termination ofthe cable and to thecorresponding conductor pairs of another cable.

"It i's particularly important that the conductor pairs" in each-cable length be properly-identified and selected'i so that they may be spliced together to provide a longconti'nuous length of cable wherein the conductor pairs at one termination maybe expeditiously connected to their"respectiveterminalsat theother end.

' In one method ofidentifying conductor pairsin-multi conductor cable whi'ch i's -in' common'usage'today, the servicesof' aflleast' two-workmen are required; viz, asplicen and-a splicers' helper;- The' splicer is" located at one end of the cable andthe helper: at theother. After" a suitable pair"of-conductorsusually arr-odd pair, have been selected by the helper, he places a tone thereon; by

any suitable'means whereby= thesplicer at the other end of the cable, byrneans of a; probe,- amplifier, and-suitable receiver, is; able to pick.up-ancliidentifiy this conductor pair and; connect thereto; suitable equipment for comers-- ing: with his helper;

Thevnext step isuthe identification andselecti'on' of" This is done: by the. helper. infiorming-the splicer over thetalking pair;;ofi" the number otthe pair to. which he is. applying tone. The splicer, after receiving this. informationirom hisrhelper the individual conductors in the cable.

probes among the. conductors at. his, end of the cable:

until he. picks up. the tone on the receiver... The splicer, upon picking up the tone, knows that this is the cable pair the number of" which was transmitted to him .over the talking pair. This operation is repeated untilall the conductors in the cable-have been identified and tagged by the splicer;

It is obvious that this method of identifying conductor pairs in a multi-conductor cable is a long and tedious one -Patentd July 1.6, 1957.

In accordance with our. invention,. an automatic. selecting device operated and underthe control. of the splicer at a remote point. is provided. The splicer. at. there.- mote point, without the services of'any other person, is able to efiect the operation offlthe seiection equipment. to place tone on any selected'conductor pair.,in..th,e'v cable. In this manner the. splicer in the field, having identified the conductor pair having the tone signalimpr'e'ssedthereon, is immediatel'ygaware that. this. is the. particular conductor pair selected" and't'henumericall identification, of that conductor pair. at the cable terminal".

Ourinvention. permits the identification of conductor.' pairs .in, multiecond'uctor cables. to be carried out rapidly and expeditiously in such. a manner that the chances. oil an error in identification are reduced to a minimum,. if not practically eliminated;

()ne object ofiour invention isthe provision of method! and means whereby the corresponding ends of conduc-. tor pairs in a mult'r-eonductor cable may be correctly and expeditiously identified". and. selected bya single person;working from one end of a. working or non-working. cable.

Another object .of the. invention is the provision of a' method and means; for identifyingconductor pairs in a. multi 'cond-u'ctor cable; whereb; the conductor pairs are;

selected and tone placed thereon automatically by means attone location which is under control of a single person ataremote location;

Other objects and advantages of the present invention will be readily apparent, from the following dctailed"description when read'i'rr connection withqthe accompanyingdrawings; in' which."

Fig, I isa view, partly; in perspective, illustrating; the component's located at the centralofii'ce with a frag,-

mentor: a maindistributing frame, the; components 10- cated -atthe remote point, connected into-acable. splice 1 and the interconnectionthereofv over a multi-conductor cable;

Fig; 2- is a schematic circuitdrawing ofthe equipment.

located: at-the central ofli'ce;-

Fig. 3 is aviewin perspective-of the apparatus. cabinet which houses the components-shownin Fig. 2; with the I connectingplugs removed from their corresponding jacks; I

Fig; 4* is a view-inperspectiveof' 'a- 20 painpl'ng ar;-. ranged to be connected-'tothe main frame and a pair of 10 pair-plugsconnected"thereto "by" means of'v a pair of cables,- each havi'ngzlO' pairs of conductors as shown in of the Fig. 9- is: a viewsimilar to' Fig; 8 and illustrates the" plug. making contact with a different type of main frame protector:

In thevarious figures and with particular reference to Fig.1, there are disclosed the components which, when associated and connected together, as shown, will permit a single person at the remote point RP, which may be any' distance from the central office, to automaticallydia-l over the. conductors 10 and 11 which are connected tothe control; pair CB, a given pair number by means of the. set D. This-.set; comprises-1a.conventional calling dial and connectionsgthereto. for transmitting electricahim-- pulses. The combination provides forautomatic applica-- tion of tone to the particular pair dialed so that the pair may be identified at the remote point by exploring between the conductor pairs of the cable C with the probe P. The probe P is connected to the set D through an amplifier AM, of well known construction, over the conductors 12 and 13 and from the set D over the cord 14 to the receiver R. The equipment thus far described is all located at a point remote from the central oflice and is intended to be operated by a single person at the remote point.

The equipment located at the central office, as shown, comprises a 20 pair plug PL, shown in Fig. 4, and more in detail in the fragmentary views to 9, inclusive. The plug comprises a body member composed of two spaced apart, parallel, insulating members 15 and 16, having interposed between their upper stepped portions a longitudinally extending insulating member 17 for maintaining the members 15 and 16 in spaced relation. Suitable bolts 18 pass through the assembly to secure the parts together and to hold the contact springs 19 and 20 in place in their respective grooves on the inner surfaces of members. 15 and 16 to maintain them in definite spaced relation. The ends of the contact springs 19 and 20 are gripped between and extend beyond the surface of the insulating members 15, 16 and 17 to provide lugs 21 and 22 to secure the ends of the conductors of the cable CA thereto, as shown in Figs. 4 and 5.

In order to facilitate the handling of the plug PL and for protective purposes, a metal cover 23, having a handle 24 thereon, is provided.

Plug PL is intended to be connected to and establish electrical contact with the protectors PR, as shown in Figs. 8 and 9, on the main distributing frame DF, a well known structure. Connected to the plug PL are a pair of cables CA and CA each cable comprising pairs of conductors which in turn are connected to the l0 pair plugs PL and PL which are of a well known type and arranged to be plugged into their respective jacks I and J on the panel PA of the apparatus cabinet CB, thereby connecting 20 pairs of conductors in the cable C to 20 pairs of connections in the apparatus cabinet CB.

The number of 20 pair plugs used will depend upon the number of conductor pairs in the cable. It is therefore obvious that with a sufiicient number of plugs, the equipment shown in suitable for use with a cable having up to 100 conductor pairs.

A control pair CP, which must be a good non-working conductor pair, is used for controlling the operation of the equipment in the housing or cabinet CB, shown in Fig. 3. This cabinet houses the necessary selector switches, relays and associated apparatus for automatically selecting the proper conductor pairs in accordance with the impulses transmitted over the control pair by the calling dial CD on the'set D, and will be described in detail in connection with the description of the operation of our invention.

As shown in Fig. 3, the front panel PA is provided with a control switchSW indicating lamps L and L and jacks 1A 1A and 1A for establishing the necessary outside connections thereto as shown in Fig. 1. The panel has also mounted thereon a plurality of multicontact jacks I. These jacks each accommodate 10 conductor pair connections, i. e., the jack J takes care of pairs 01 to 10, jack J takes care of pairs 11 to 20, and so on. For the purpose of illustration we have shown 10 jacks J to I inclusive, of 10 pairs each which will take care of 100 conductor pairs. However, it is to be understood that we are not limited to this number as it may be increased or decreased, depending upon the requirements.

The control pair CP is readily picked up and identified by the tone method and connected to its respective terminals on the main frame over the control cable CC, which is plugged into its respective jack IA on the panel of the apparatus cabinet CB.

A tone generator TG, which is automatically operated as heretofore referred to and which will hereinafter be described in detail is also connected to the cabinet CB by means of a plug on the end of the tone cable TC inserted in the jack J Eneregy for the operation of the equipment in the control cabinet CB is supplied by the battery BT over the cable PC which is connected to the receptacle labeled LBATISQ In the utilization of our heretofore described apparatus for identifying conductor pairs in a multi-conductor cable at a remote point, the following procedure is followed: While our invention has been disclosed with respect to its use with pair cable, we are not limited to this precise size of cable as it is obvious that the capacity of the apparatus may be increased by the addition of components. For the sake of clarity we have disclosed only a pair of 10 pair plugs PL and PL associated with the panel PA on the apparatus cabinet CB and a single 20 pair plug PL at the main frame of the central oflice since the operation and structure of additional plugs are the same.

After the apparatus cabinet CB has been placed in the central office in a convenient location adjacent the main distributing frame and connections between the various components have been made as shown in Fig. 1 (central office), the actuation of the switch SW on the panel PA to its on position will supply power to the equipment and its operation may be checked by observing whether or not the lamp L which is labeled Standby is burning. The tone switch SW on the tone generator TG is then operated which applies tone to the control pair CP which may be checked by touching the test clips of a head receiver to the test clips on the ends of the control cord CC where they are attached to the main distributing frame DF.

remote point on the cable CA where a splice or tennination is to be made, the set D with its associated dial CD is supported from the strand as shown in Fig. 1 and the ground terminal thereof is connected to the sheath of the cable. After the necessary connections are made from the head receiver R to the set D and to the components associated therewith, the control pair CP, having tone impressed thereon, is located by using the probe P which is connected through the amplifier AM to the set D and thence to the head receiver R. After the control pair CP has been located, the conductor pairs 10 and 11 on the set D are connected thereto. After the components at the remote point have all been connected as shown, the switch SW on the set D is turned to its Dial position and the equipment is ready for the dialing of the number of a desired conductor pair.

Upon the dialing of the conductor pair number, the apparatus in the cabinet CB will bridge onto this pair. In the event that the pair is busy, which can be readily determined in the usual Way, another pair should be dialed. If the dialed pair is not busy, dial one digit. This will place tone across the pair and the pair may now be located by means of the probe P and the head receiver R. After the desired pair has been located, the tip and ring sides are determined as follows. Dial one digit to place tone on the tip side. After the tip side has been identified, place tone on the ring side by dialing the digit 1. In the event that there is some doubt as to which are the tip and ring sides, dial one digit; this will remove tone from the pair. Then dial one digit to place the tone on the tip side and then one again to place tone on the ring side.

After the pair and its sides have been identified, the switch SW is now turned to its release position. Other pairs in the cable are identified by repeating the above procedure.

With reference to the circuit diagramshown in Fig.

After the above operation has been completed, at a 2, the circuit and the operation described above t ey be traced asfollows.

When a t i di led. at h s t D at a e nqte p nt, h dial Whih i n r al 929 ternate pe aid Shorts fsqm l. Pa r; t ereb a s n elay K1 to open andvclose Relay K2, was caused to operate h h h when of re a i we, cond c or as'sooil 't e qo trslina i ias ni a ly. hqrtei. i a w l s e and es q fel w thesiie i aru ses from e Ki but remains o era n il he p ic hangs up. Henceground is appl don the first pulse to thevertical magi et' VERT, from the bacl contact of relay K1, over conductor '31, throughthe back. contact i r 2 ev r s at u tq filthreneh e e i fi I16m1a1$pfit1a N vert e c as ucter 33 hr h the winding of relay K4, over coug y tgr fi o the winding of ver tic al relay VERT, therehy causing relay K; to operate ahd are the. nsswi sh $5 1 Step. e cal Sir ce the relay K4 :is: aslow release relay, it remains operatedaurin the operationofthe first pulsetrain.

e t al f-s uea sp in s VON r m ch a operated on the first vertical ste p. of the switch shaft; thereafter ground is applied on anysubseguentpulse of the first digit to the vertical m agnet VERT, through a cr'ltact 1v lay contes o re a K ver a r a n sf rltastsfof he lay K nd. gh the winding or relay K3 tofthe vertical magnet VERT.

After h t tfpli seftrain-has e n c mpleted, r y K is ds- 'n'er i df e 24. r se step t tea a n- The i 1 1 the .1%? d gi wus ss nd o be. pp to relay K and to therotary magnet RQT1 through the r' fsrma f Spr ngs QNL. rer-condu e 35 o the winding or relay Kgca singit to operate'over coni st fi. to he fr ntsnt t of rela Ks the a previously established thro h the vertical oft-normal ti s an e s nnet of re ays K an K Th ta b tmal. S r ng Operat mesha l on.

e r t ta y tep. an any. sub e uent Pu es f e.

s i 5, 1% plied. o the st rr ma RT1. through the i din and. qntects- Q ears.

Theoperation Q slar a s uscs teu d to h i a r l s r g he ath ost fi 'a Ks e w l s r. 37; to' e winding of e. p h o at n o lay Ks. he cmaallys s d front .confasts will open and disconnect thecontrolj pair 38 and, 39 from,

he w pe e ds 0.a; d 4.1 h reb preve n n se m appearing on ya busy lineas t he wiper WP moves across the bank of the stepping switch SS Relay K3 is also a slow release relay and remains operatedtorthe duration. of h c nd ulse aim After the second pulse trair is completed, relay K3 re-.

leases, and does not operateagain, this releases. relay K6,

thus bridging the control pair 38 and39 across the selected.

pair'fl ro h ca a or CP-C or nito ngp p The rotary'selector switch RS operates on the pulses of the third an any Subsequent digit and ground is applied,

to the winding of the rotaryv selector n agnet ROT2 for the operation thereofi and the circuit may betraced as follows: From one side of the magnet ROTz through RQNr, over condu ctor 48, through the contacts on K3, over 36, through contacts on K4, over 49, through VON1, over 32 through contacts K2, over 30, through contacts.

Kr to ground, thereby causing the rotary selector switch RS to operate.

The operation mechanically of the RONz springs applies ground tothe winding of relay K6 to energize it and thereby remove the control pair 1 3 a nd 39 from the selector bank wiper WP. This'circuit may be traced as follows: From ground .throughfihe springs. RON2 over conductor 37 to relay Ks, otherwisethe control pair 38 anjd39 would be in, parallel with the selected pair and tone on the selected pair wouldalso appear on. the control pair as well. It will, be ob served that when the third digitis 1, tone wilLbeappliedbetweenthe tip and. ring;

when it is 2, or,8-it will be applied;between tip 6 and ground; when it is "3,? 6. or 9 it will beapp lied between ring and ground and whenit is 4, 7 or' l0 no tone will be app Th a r etq .RSr i ladva s on v ry d g t dialed atter the. pair is selected, i. e. if the, workman has applied tone across the pair by dialing 1 as the third digit, he can apply tone between tip and ground bydialing 1 again and between ring and ground-by dialing "1 athir e He .s,.a 2 .e 9. w tch tqnebictwee p and in three me if ece sa with ut hangi p d redialing the pair, The positions with nov tone on them will serve as index, Thus, if the splicer needs to check whether his tone is on tip or ring, he dials "1- repeatedly until the to e disappears; hethen knows if he dials'l again, toneiwill appear on the tip.

When the control pair is opened, for. example by placing the switch, SW, on the set in its releaseposition, relays K1 and, Ka elease, round. is app ied. o e r release magnet RLSg over cohductor 42 through the contacts, of the rotary ofi-norrnal springs RONz, over conductor 43, through a front contact 11 r'e lgy Kg ovenconductor 31, r u h. fr m on est re ayKi. h nc to groun his au es. e. e ease. ma e vRL z to, ope ate nd. store the rotary selector switQhRS and, its off-normal p n ONz. q'usrmalre nd. is th n pp ie t t stepping switch release magnet RLSrover the condu tor 44, through thecontacts on the vertical off-normal springs VON1 over condnctors 44}, through, the contacts on the ot ry old-no mal pt n sRQNa. sv n r 43 ea front con ct on relaylKg, over conductor 31.throug h front contact on relay K1 to ground thereby causing the stepping switch S S to releascland restore, the rotary offormal P inssRQN-r o, na malund isthen plied to relay Ks through thecontacts, on relay RL S1, ver dustqts 5,- a...d-. -.3Z.; her by ho di g y K in its operated position to, prevent noise being heardon a busy line asthe bank; wiper restoresto normal. The release of the stepping switch SS ,is-,applied until the rotaryselector RS 'wiper WPais off its bank. for the same reason. When, the vertical oif-norrnal springs YQNr andthe rotaryofiE-norrnal springs RON; restore to normal, ground, is removed from theselector release magnets, relay Kg ,thenreleases, due tothe releaseof relay K 1 since control, pair is. no, longer shorted, thus cornpleting, thecycle vof operation.

' When the splicer at the remote; point desires to, call the central oi'lice, he,connec-ts both/sides. of the control pair together and grounds it inthe cable CA which is connectedthrough the control cableCC tothe conductors 46 and. 47, by means ,ofthe jack connection labeled;

Control? by, connecting his. talking set to the set D. This action-shorts one winding. of the relay K1 and one winding'of the relay K1 andone winding of the, relay Kstthusv relayK cannot be operatedsinceboth windings must;

the operation of the alarm AL, a person at the central, ofiice ,plugs his telephone set into; the jack-labeled Talk and answers thesplicer s call.

As, shown, a. test jack labeled Talk is provided for.

testing; purposes. This jack is; connected through tip and I o ring conductors .T and R, through front contacts on the.

intention to be restricted" to working or non-working. pairs r" of conductors since the invention as disclosed may be used on either working or non-working conductor pairs with equal success. It is obvious that with our method and means for identifying conductor pairs in a multiconductor cable, we can identify individual conductor pairs irrespective of the number of pairs or pair groups in the cable.

What is claimed is:

1. Apparatus for identifying conductor pairs in a multiconductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of power connected to said mechanism for the operation thereof, means connecting said mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said mechanism is controlled, means at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, an impulse transmitting mechanism connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source for applying tone to the selected conductor pair, under the control of said selector mechanism, and means at the remote end of the cable, including amplifying means connected to said impulse transmitting mechanism, for exploring the conductor pairs, detecting an audible tone impressed upon a particular conductor pair for the identification thereof.

2. Apparatus for identifying conductor pairs in a multi-conductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of power directly connected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, a cord set having a plurality of multiconductor connecting plugs on one end thereof and a single multi-conductor plug at the other end, for connecting a plurality of conductor pairs in the cable to said selector mechanism, an impulse transmitting mechanism connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source for applying tone to the selector conductor pair, under the control of said selector mechanism, any means at the remote end of the cable, including amplifying means, connected to said impulse ttransmitting mechanism, for exploring the conductor pairs for detecting an audible tone impressed upon a particular conductor pair for the identification thereof.

3. Apparatus for identifying conductor pairs in a multiconductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of power directly connected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, means at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, a dialing device at the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source for applying tone to the selected conductor pair, under the control of said selector mechanism, and means at the remote end of the cable, including amplifying means,

ductor pairs, detecting an audible tone impressed upon.

a particular conductor pair for the identification thereof.

4. Apparatus for identifying conductor pairs in a multiconductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of power directly connected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, a cord set having a plurality of multi-conductor connecting plugs on one end and a single multi-conductor plug at the other end, for connecting a plurality of conductor pairs in the cable to said selector mechanism, a dialing device at the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source for applying tone to the selected conductor pair, under the control of said selector mechanism, and means at the remote end of the cable, including amplifying means, connected to said dialing device, for exploring the conductor pairs, picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof.

5. Apparatus for identifying conductor pairs in a multi-conductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of electrical energy directly con nected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, means at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, an impulse transmitting mechanism, connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source connected to said selector for applying tone to the selected conductor pair and under the control of said selector mechanism, and means at the remote end of the cable, including amplifying means connected to said impulse transmitting mechanism, for exploring the conductor pairs, picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof.

6. Apparatus for identifying conductor pairs in a multi-conductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of electrical energy directly connected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, a cord set having a plurality of multi-conductor connecting plugs at the selector end and a single multi-conductor plug at the other end, for connecting a plurality of conductor pairs in the cable to said selector mechanism, means connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source connected to said selector for applying tone to the selected conductor pair, and under the control of said selector mechanism, and means at the remote end of the cable for exploring the conductor pairs, picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof.

7. Apparatus for identifying conductor pairs in a multiconductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of electrical energy directly connected to said selector for the operation thereof, means connecting said selector mechanism to a non-working control pair of conductors in said cable. at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, means at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, a dialing device at the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source connected to said selector for applying tone to the selected conductor pair, and under the control of said selector mechanism, and means at the remote end of the cable, including amplifying means, connected to said dialing device, for exploring the conductor pairs, picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof.

8. Apparatus for identifying conductor pairs in a multi-conductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, a source of electrical energy directly connected to said selector for the operation thereof, means connecting said selector mechanism to 'a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, a cord set having multi-conductor connecting plugs on each end thereof at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, a dialing device at the remote end of said cable for automatically transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source connected to said selector for applying tone to the selected conductor pair, and under the control of said selector mechanism, means at the remote end of thecable for exploring the conductor pairs for picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof, and means included in the electrical circuit of said selector mechanism for preventing noise appearing on a busy line, as said selector mechanism operates to locate a conductor pair.

9. Apparatus for identifying conductor pairs in a multiconductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, means at the other end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, means connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a tip and ring conductor pair in said cable, a signal source for applying tone to the selected conductor pair, under the control of said selector mechanism, a probe at the remote end of the cable in circuit with an amplifier and connected to said impulse transmitting means, a head receiver also connected to said impulse transmitter for picking up and observing an audible tone impressed upon the tip and ring of a particular conductor pair for the identification thereof, and means for applying tone between the tip and ring conductors when certain digits are dialed, between tip and ground when :a different set of digits are dialed and between ring and ground when still another set of digits are dialed.

10. Apparatus for identifying conductor pairs in a multi-conductor cable, the ends of which are remotely spaced from each other, comprising a conductor pair selector mechanism at the central ofiice, means connecting said selector mechanism to a non-working control pair of conductors in said cable at one end thereof, means connected to said control pair of conductors at the remote end of the cable over which the operation of said selector mechanism is controlled, a cord set having multiconductor connecting plugs on each end thereof at the central office end of the cable for connecting a plurality of conductor pairs in the cable to said selector mechanism, means connected to the remote end of said cable for transmitting electrical impulses over said control pair of conductors to said selector mechanism for establishing an electrical connection with a conductor pair in said cable, a signal source for applying tone to the selected conductor pair, under the control of said selector mechanism, a probe at the remote end of the cable in circuit with an amplifier and connected to said impulse transmitting means, a head receiver also connected to said impulse transmitter for picking up and observing an audible tone impressed upon a particular conductor pair for the identification thereof, and means at the remote location for signaling the central ofiice and establishing a talking connection therewith.

No references cited. 

